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Borrowings - Federal Home Loan Bank Advances (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Collateral securing line of credit | $ 2,781,606,000 | $ 958,506,000
Total borrowing capacity remaining | 1,276,095,000 | 760,607,000
Letter of credit pledged | 100,000,000 | 75,000,000
Borrowings against line of credit | 0 | $ 250,000,000
Weighted average interest rate on outstanding advances |  | 1.60%
Federal Reserve Bank |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Pledged loans to the Federal Reserve Bank | 2,463,281,000 | $ 1,407,662,000
Line of credit | 1,695,639,000 | 1,013,239,000
Collateral Pledged |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Securities pledged | 804,821,000 | 373,674,000
Collateral Pledged | Federal Reserve Bank |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Securities pledged | 0 | 4,963,000
FHLB Overnight |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Additional line available | 800,000,000 | 800,000,000
Long Term Advances |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Borrowings against line of credit |  | 150,000,000
90 Day Fixed Rate Advance |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Borrowings against line of credit |  | $ 100,000,000
Advance term |  | 90 days
FHLB Advance 10 Year |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Borrowings against line of credit |  | $ 100,000
Advance term |  | 10 years
Early termination costs | $ 6,838,000 |
FHLB Advance 7 Year |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Borrowings against line of credit |  | $ 50,000
Advance term |  | 7 years

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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